Heating-furnace.



B. F. BUTLER.

HEATING FURNACE.

APPLICATION FILED JUNE 8.1915.

Patented May 23, 1916.

Attorneys BENJAMIN F. BUTLER, OF LOVELAND, IOWA.

HEATINGQFURNACE.

Application filed June 8, 1915.

To all whom it may concern:

Be it known that I, BENJAMIN F. BUTLER, a citizen of the United States, residing at Loveland, in the county of Pottawattamie and State of Iowa, have invented a new and useful Heating-Furnace, of which the following is a specification.

The present invention appertains to hot air "furnaces, and aims to provide a novel and improved heating furnace of that type.

The invention has for its object the provision of a hot air furnace of unique construction, whereby the fresh air is taken through hollow or tubular grate bars, so

.that the fresh air will cool the grate bars,

and furthermore the fresh air will be given an initial heat at the same time.

Another object of the invention is to so construct and assemble the component parts of the furnace, that the desired results will be carried out in a most practical and eflicient manner.

With the foregoing and other objects in view which will appear as the description proceeds, theinvention resides in the combination and arrangement of parts and-in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within-the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a vertical central section of the improved furnace. Fig. 2 is a fragmental view of the furnace, looking from the rear. Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1.

In carrying out the invention, there is provided an inner upright cylindrical drum 1 having the upper combustion chamber 2 therein, the fire pot 3 between its upper and lower ends, and the ash pit 4 at its lower end and below the fire pot. The drum 1 has a rearwardly or laterally projecting outlet sleeve 5 adjacent its lower end and communicating with the ash pit 4, and is provided with a rearwardly orlaterally projecting sleeve 6 adjacent its upper end and communicating with the combustion chamber 2. v

A discharge pipe 7, leading to the chimney, has. its lower end slipped into engagement with the lower outlet sleeve 5, and is provided above its lower end with a branch Specification of Letters Patent.

Patented May 23, 1916.

Serial No. 32,888.

8 slipped into engagement with the upper outlet sleeve 6 of the drum. A damper 9 1s pivoted within the outlet sleeve 6 to control the outlet of the gases through the said sleeve, and a damper 10 is pivoted within the pipe 7 between the branch 8 and lower end of the pipe, for controlling the outlet of gases through the outlet sleeve 5.

The front wall of the drum 1 has an opening 11 immediately above the fire pot 3 communicating with the combustion cham ber 2, and said front wall of the drum is provided with an ash opening 12 below the fire pot 3 and communicating with the ash ing 15 for normally closing the opening through the casting, although one or both of the doors 16 may be opened for admitting air into the drum, or for enabling the coal or other fuel'to be shoveled into the fire pot.

A rectangular-casting 17 extends through a rectangular opening in the front wall of the jacket 13 below the casting 15, and embodies a top, bottom and sides having flanges at their rear edges attached to the drum around the opening 12 thereof. The casting has a front plate overlapping and attached to the jacket, and has a horizontal partition between the top and bottom to provide an air inlet chamber 19 above the partition. Said front plate has an upper opening 20 above the partition, and a lower opening below said partition, the opening 12 of the drum also being located below said partition. As ash door 18 is hinged at one end to the outer side of the front plate of the casting 17 at one side of the lower opening to close said opening, and an air controlling door 21 is hinged to the inner side of said front plate above the upper opening thereof, to swing downwardly against the front plate to close the opening 20, and 1 "by means of a link 22 with the upper edge of the ash door '18 adjacent the hinge of the ash door, whereby when the ash door 18 is swung to closed position, the link 22 swings the air controlling door 21 rearwardly and upwardly against the top of the casting 17 while when the door 18 is swung open, the link 22 pulls the door 21 downwardly and forwardly; to close the open.- ing 20.

The grate embodies a plurality or series of parallel rearwardly inclined tubular or hollow grate bars 23 extending through the front and back walls of the drum 1. The lower orforward ends of the grate bars 23 are received by the chamber 19 whereby fresh air may flow upwardly through the grate bars 23 from the chamber 19 into the air space between the drum 1 and jacket 13.

As a means for supporting the upper or rear ends of the grate bars 23, a casting 24; is secured to the back wall of the drum 1 above the outlet sleeve 5, anda plate 25 is secured in any suitable manner to the casting 24. The rear'or upper ends of the grate bars 23 are engaged through the plate 25, and nuts 26 are threaded upon the rear end portions of the grate bars 23 and bear against the outer and inner sides of the plate 25, for adjustably holding the grate bars 23 in position.

The walls of the fire pot 3 are preferably lined with fire brick or other refractory material 27, the fire brick or lining 27 being supported by the grate bars 23.

. A siphon pipe or tube 28 which is disposed exteriorlyof the drum land within the jacket 13 has its upper end engaged to the center of the dome shaped upper end of the drum 1, and has its lower end engaged through one side of the drum 1 below the grate to communicate withthe ash pit 4.

In operation, when an updraft through the grate is desired, the damper 9 is opened, and the damper 10 is closed, whereby the products of combustion are constrained to rise upwardly through the outlet sleeve 6 into the pipe 7. Air is admitted'through the ash door 18 so as to pass upwardly through the grate and coals, whereby the products of combustion rise in the combus tion chamber 2 for heating the walls of the drum 1, so that the air between the drum and jacket is'properly-heated. The cooler air at the upper end of the drum 1' is si phoned down through the pipe or tube 28 into the ash pit below the grateowhereby it will be drawn upwardly through the grate andcoals. This prevents the cooler air being trapped at the upper end ofthe drum, and the drum is therefore properly heated throughout its upper portion, for properly heating the air between the drumand jacket.

The air to be heated is drawninwardly through the-chamber 1'9 and tubular grate bars 23, and will flow intotheiairheating' fresh air will bev given an initial heat, to,

increase the efficiency of the furnace. When the door 18 isopened for taking out the ashes, the door 21 will be closed, and'this will prevent the dust from being drawn into the air heating chamber through the chamber 19 and grate bars 23, while the ashes are being removed, but as soon as the ash door is again closed, the door 21 will be opened to allow fresh air to again flow into the jacket. The grate bars being inclined rear- .wardly tend to cause the coals to shift forwardly within the fire pot, which will facilitate the falling of the ashes through the grate, and furthermore,the coals will be worked forwardly so that the-new coals in being shoveled through the opening 11 will be properly received at the rear or upper portion of the grate. The inclination-of the grate bars 23 is also of advantage since the heated air within the grate bars will rise properly into the heating chamber within 1 U the jacket. When a downdraft is desired,

the damper 9 is closed, and the damper 10 is opened, so that the products of combustion are constrained to pass downwardly through the outlet-sleeve 5 into the pipe 7. f

One of the doors 16 is opened to admit air into the combustion chamber 2 and firepo-t 3, whereby the air will pass downwardly through the coalsand grate. The air in ioc being drawn downwardly through'the'coals,

will reduce to a minimum, the clinkering of the coal and ashes, and; furthermore, the products of combustion which naturally I tend-to rise within the combustion'chamber 2, will be caught and carried downwardly withthe air through the coals. The heated coals will thus cause the soot and heavier particles of the products of combustion to be consumed, wherebythe heavy or dense smoke is eliminated, and a saving .1. of fuel accomplished.

Having thus described the invention, 'what is clalmed as new 1s: v a

A hot air furnace embodying a drum, a

jacket 'inclosing the same, there being an air a 120 heating chamber between the 'drum 'and jacket, a rectangular r casting extending through the jacket and including'a top,bo'tv l tom and sides having flangesat their jrear'i edges attached tothe drum,the casting hav- Y ;ing a front plate overlapping and 'attached tothe jacket, said casting also having a horitom'to'provide an air inletchamber above said partition, tubes extending through the 'drum from said-air inlet chamber to the air zontal partition between the top and bot-2 no r plate at one side of said lower openingthereof to close said opening, an air controlling door hinged to the inner side of said front plate above the upper opening thereof, and a link connecting the free edge of the air controlling door and the upper edge of the ash door adjacent the hinge of the ash door, whereby when the ash door is closed and opened, the air controlling door is opened and closed, respectively.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two Witnesses.

BENJAMIN F. BUTLER.

Witnesses:

W. D. CODY, J. T. ZUVER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

